This street view in the following article shows a yield. The Google satellite view shows a stop.
https://jalopnik.com/the-deadly-phen...-ed-1821999343
This rewording of the article makes the point more clear.
https://boingboing.net/2018/01/10/69-degrees.html
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It seems likely that the drivers wouldn't even be looking at the cross road in the purple and blue zones (maybe, even later). Even if there wasn't an obstruction (the A pillar), they might not be able to see a cyclist at those distances.
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Keep in mind that the idea is that there are three things that combined in this case to make the collisions more likely.
1- The approximate relative speeds of the to.
2- The angle (69') that would require the cyclist to look back a bit to be able to see the approaching car.
3- Where the A pillar happened to be (relative to the other things).
It appears the intersection now has a stop sign (and used to have a yield). We don't know when that change was made or what the status was when the collisions occurred.
We only know about the collisions with cyclists. We know nothing about whether there were other collisions there.